//
//  QQCycleView.m
//  CycleScrollViewDemo
//
//  Created by lanou3g on 16/4/19.
//  Copyright © 2016年 qiu. All rights reserved.
//

#import "QQCycleView.h"

@interface QQCycleView()<UIScrollViewDelegate>
//scrollView
@property (nonatomic,strong) UIScrollView *imgScrollView;
//PageControl
@property (nonatomic,strong) UIPageControl *imgPageControl;
//imgViewArray
@property (nonatomic,strong) NSMutableArray *imgViewArray;
//存放图片的数组
@property (nonatomic,strong)NSMutableArray *imgArray;
//当前展示的图片下表
@property (nonatomic,assign)NSInteger index;
//定时器
@property (nonatomic,strong) NSTimer *imgTimer;
//点击回调block
@property(nonatomic,copy) void(^tapBlock)(NSInteger index);


//时间间隔的属性

@end

@implementation QQCycleView


//初始化
- (instancetype)initWithFrame:(CGRect)frame interVal:(NSTimeInterval)interVal{

    self = [super initWithFrame:frame];
    if (self) {
        self.imgViewArray = [NSMutableArray new];
        self.imgArray = [NSMutableArray new];
        self.imgScrollView = [[UIScrollView alloc]initWithFrame:self.bounds];
        self.imgScrollView.contentSize = CGSizeMake(frame.size.width *3, frame.size.height);
        [self addSubview:self.imgScrollView];
    
    
        for (int i = 0; i < 3; i++) {
            UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(frame.size.width * i , 0, frame.size.width, frame.size.height)];
            //添加到父视图，数组
            [self.imgScrollView addSubview:imgView];
            [self.imgViewArray addObject:imgView];
            
            self.imgScrollView.delegate = self;
        }
        
        // timer 初始化
            if (interVal <= 0) {
                self.imgTimer = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(timerAction) userInfo:nil repeats:YES];
            }else{

                self.imgTimer = [NSTimer scheduledTimerWithTimeInterval:interVal target:self selector:@selector(timerAction) userInfo:nil repeats:YES];
        }
    }
    return self;

}

//图片滚动方法
- (void)timerAction {

    [self.imgScrollView setContentOffset:CGPointMake(self.imgScrollView.frame.size.width * 2, 0) animated:YES];
   // 改变index
    self.index = (self.index + 1) % self.imgNameArray.count;
}

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{

    //图片回位
    [self.imgScrollView setContentOffset:CGPointMake(scrollView.frame.size.width, 0)  animated:NO];
    
    [self layoutImages];

}


//图片名数组setter
- (void)setImgNameArray:(NSMutableArray *)imgNameArray{
    
    if (_imgNameArray != imgNameArray) {
        _imgNameArray = imgNameArray;
        //设置PageControl
        [self.imgPageControl removeFromSuperview];
        self.imgPageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, self.frame.size.height - 40, self.frame.size.width, 40)];
        [self addSubview:self.imgPageControl];
        //属性        self.imgPageControl.currentPage = 0;
        self.imgPageControl.numberOfPages = _imgNameArray.count;
        //关掉PageControl响应
        self.imgPageControl.enabled = NO;
        
        self.imgScrollView.pagingEnabled = YES;
        self.imgScrollView.showsHorizontalScrollIndicator = NO;
        
        
        for (int i = 0; i < imgNameArray.count; i++) {
            UIImage *img = [UIImage imageNamed:imgNameArray[i]];
            
            [self.imgArray addObject:img];
       
            if (i < 3 ) {
                [self.imgViewArray[i] setImage:img];
                
             }
         }
        //设置当前偏移量
        [self.imgScrollView setContentOffset:CGPointMake(self.frame.size.width, 0) animated:NO];
        self.index = 0;
        [self layoutImages];
        //点击手势 数据过来以后
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapCycleViewAction:)];
        [(UIImageView *)self.imgViewArray[1] addGestureRecognizer:tap];
        [(UIImageView *)self.imgViewArray[1] setUserInteractionEnabled:YES];
    }
}

- (void)tapCycleViewAction:(UITapGestureRecognizer *)tap{
    if (self.tapBlock) {
        self.tapBlock(self.index);
    }
    
}


#pragma mark  ---- UIScrollViewDelegate
//开始拖动
static CGFloat  x = 0;
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
   
    x = scrollView.contentOffset.x;
    [self.imgTimer setFireDate:[NSDate distantFuture]];
    
}

//减速动画结束
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    
    if (x > scrollView.contentOffset.x) {
        [self panToLeft:NO Index:self.index];
    }else if(x < scrollView.contentOffset.x){
        [self panToLeft:YES Index:self.index];
    }
    [self.imgTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:2]];
}

#pragma mark --- 向左滑动，向右滑动结束切换
- (void)panToLeft:(BOOL)left Index:(NSInteger)index {
    if (!left) {
        self.index = (index - 1 + self.imgNameArray.count) % self.imgNameArray.count;
    }else{
        self.index = (index + 1) % self.imgNameArray.count;
}
    
    //切换图片
    [self layoutImages];
    
    //回位操作
    [self.imgScrollView setContentOffset:CGPointMake(self.frame.size.width, 0) animated:NO];

}

- (void)layoutImages{

    for (int i = 0; i < 3; i++) {
        [self.imgViewArray[i] setImage:self.imgArray[(self.index - 1 + i + self.imgNameArray.count) % self.imgNameArray.count ]];
    }

}

//重写index的setter方法 让PageControl跟着走
- (void)setIndex:(NSInteger)index{
    if (_index != index) {
        _index = index;
        self.imgPageControl.currentPage = index;
    }
    
}


//添加Block回调
- (void)addTapBlock:(void(^)(NSInteger index))block{

    self.tapBlock = block;

}


/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end
